Method for the production of flap sliding buckles



March 10, 1931. I I HELLMANN v I 1,795,559

METHOD FOR THE PRODUCTION OF FLAP SLIDING BUCKLES Filed July 8, 1929 Fig.1

Patented Mar. 10, 1931 HEINRICH HELLMANN, OF LUDENSCHEID, GERMANY METHOD FOR THE PRODUCTION OF FLAP SLIDING BUCKL ES Application filed July 8, 1929, Serial No.

The invention relates to a method of producing flap sliding buckles for braces or such like. With the new method buckle-bed and flap are punched out of the same strip of sheet-metal and joined prior to being entirely detached from the strip of sheet-metal.

A particular feature of the new method consists therein, that the serrated edge of the buckle-flap and the upper edge of the bed are punched out by means of a common out, i. e. immediately adjoining each other and that the lateral parts of the buckle-bed are turned over without shrinkage of the lateral wastestrip and made to engage with the pivots.

The new method is characterized by the fact, that on the one hand the waste of material is restricted within the narrowest possible limits and on the other hand, it embodies the advantage, that the method may be carried out by means of an ordinary press for multiple cut, in which the whole of the tools are attached to a common ascending and descending slide.

In the drawing Figs. 1 and 2 illustrate the 95 various phases of operation of the method in a plan-view and in longitudinal section, whilst in Figs. 3 and 4 the completed article is shown in a plan-view and in longitudinal section.

(t represents a strip of sheet-metal from which flap sliding buckles are made in one continuous working operation such as illus trated in Fig. 3. This buckle consists in a manner known in itself, of the buckle-bed I) and the flapcl, positioned within the bent-up lateral parts 0. This flap is as usual, in its cross-section of angular shape, so that it forms an angle-lever, of which the short arm f acts as clamping member and its long arm as lever.

The method for the production of flap sliding buckles is sub-divided in the example of performance in six working-phases.

During phase I two longitudinal slots 9,

parallel with the lateral edges of the flap d,

f are punched out of the narrow strip of sheet metal intermittently moving forward in the direction of the arrow X, whilst at the same time and close to the lower end of each of the slots a keeper recess or socket h for the recep- 376,523, and in Germany April a, 1928.

tion of the pivot, as well as a stiffening rib i for the buckle-bed Z) is pressed in.

During phase II the serrated edge of the flap cl, f and of the bed 6 are punched in one common out In, whereby simultaneously the laterally projecting pivots m, as well as the limiting cuts 0 of the bearing flanges or lugs c, inclined obliquely to the direction of movement, are formed at the ends of the cut below the flange.

During phase III the serrated lower edge of the flap provided with pivots m at the ends is bent upwards, whilst the clamping arm thus formed is inclined at an acute angle against the other arm during phase IV. It will be seen, that simultaneously with this bending over the pivots are brought up to the level of the flanges, so that during phase V, during which the lateral flanges or lugs 0- are bent at right angles to the bed I), the pivots m are made to engage in the recesses or sockets h.

During phase VI the buckle is completed and detached from the strip of sheet-metal by performing the cuts 1", 8 indicated by dotted lines in phase V.

It will be seen, that the waste of material is quite minimal and the production is eflected without any shrinkage of the lateral wastestrip t.

The whole of the working phases described are performed simultaneously, owing to the fact, that all the tools are attached to a common ascending and descending slide, with the result, that with each stroke of the press a 8 completed buckle drops out of the machine.

I claim:

1. Method for producing flap sliding buckles which comprises punching a sheet metal strip to form a buckle bed member and a flap member in the strip, simultaneously forming hinge flanges with sockets in one member and complementary pivots upon the other member, then bending the flanges to pass the pivot members into the sockets so as to complete the hinge while the buckle members are still in the original metal strip and. without lateral shrinkage of the latter, and finally severing the completed buckle from the strip.

:2. Method for producing flap sliding buckles which comprises punching a sheet metal strip to form slots adjacent to and parallel with the lateral edges of the strips and keeper sockets adjacent to said slots, then punching the strip to produce cuts intersecting said slots and forming the serrated edges and bearing flanges containing said sockets of inchoate flap and bed members and to provide the flap member with pivots, then bending the flap member into angle form, then bending the flanges of the bed member at an angle thereto to bring the sockets thereof into engagement with the pivots of the flap member Without bending the lateral margins of the strip or laterally shrinking said strip, and finally severing the completed buckle thus formed from the strip.

In testimony whereof I affix my signature.

HEINRICH HELLMANN. 

